Thanks for the reply! We're talking to Variscite as well, but they can't give us any NXP-specific documentation, they saying we should get that information from NXP.
USB core is part of the NXP SoC. And what we seeing is, there are behavioral differences in USB area beween MX8M and MX8M-PLUS. Looking at the device tree, I can see there were hardware changes: on MX8M-PLUS dwc3 now connected via small shim layer, where on MX8M it was connected directly to the NXP core. Also, it has just single clock parent vs. two on MX8M. It has different quirks setup in dtb, etc.
The assumption was that as far as USB concerned, we can replace MX8M SOM with MX8M-PLUS and it should work. What we seeing is that it doesn't. If there are hardware or software changes required, we need to know about them.
